I'm not sure if you received some updates from Apple which have impacted the VPN Cert. If your CERT is showing as "invalid" you have to go into that CERT and set the IP Security field to "ALWAYS TRUST". You will have to do the same action for all of your work related CERT's (there may be serveral)

More Like This

Retrieving data ...

This site contains user submitted content, comments and opinions and is for informational purposes only.
Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.
Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.